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Drill

A drill bit and plastic technology, applied in the direction of twist drills, drill accessories, drilling/drilling equipment, etc., can solve the problems of high expenditure costs, achieve long service life, reliable cutting, and avoid uneven effects

Inactive Publication Date: 2012-08-22
MAPAL FABRIK FUER PRAEZISIONSWERKZEUGE (DE)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the drilling results do not in all cases meet the requirements with regard to the surface quality of the borehole wall and the shape accuracy of the borehole and therefore require improvement
In addition, the outlay and thus the costs in the manufacture of drill bits are relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] exist figure 1 A schematic top view of a first embodiment of the drill bit 1 is illustrated in . The viewing direction is from above towards the tip 3 of the drill 1 .

[0032] The drill 1 has a base body 5 on which a first main cutting edge 7 and a second main cutting edge 7' arranged centrally symmetrically with respect to the axis of rotation of the drill extending through the tip 3 are arranged. The two main cutting edges 7, 7' are arranged parallel to an imaginary straight line 9 extending through the axis of rotation and corresponding to the diameter line. The distance A between the straight line 9 and the main cutting edges 7, 7' is approximately 15% of the main hole diameter of the drill 1, respectively. The main borehole diameter is the diameter of the drill 1 measured radially between the points of the main cutting edges 7, 7' furthest from the axis of rotation, which lie in front of the straight line 9 in the direction of rotation of the drill 1 indicated b...

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Abstract

The invention relates to a drill (1) for producing a drilled hole in workpieces comprising fiber-reinforced plastic, having at least one main cutting edge (7, 7') on the end face, with at least one secondary cutting edge (19, 19'), provided in the region of a circumferential surface (17) of the drill (1), and having at least one circularly ground lands (29), circumferentially adjoining the at least one secondary cutting edge (19, 19'). The drill is characterized in that the circularly ground lands (29) extend over a first longitudinal section (31) in the front area of the secondary cutting edge (19), and in that, in a following second longitudinal section (35), a secondary flank (37) circumferentially adjoins the secondary cutting edge (19).

Description

technical field [0001] The invention relates to a drill according to the preamble of claim 1 for producing boreholes in workpieces comprising fiber-reinforced plastic. Background technique [0002] When machining workpieces with fiber-reinforced (for example glass-fiber-reinforced or carbon-fiber-reinforced) plastics, it is especially important that the fibers are cut cleanly at the cutting edge and that the fibers are not pulled out of the raw compound. Untidy (ie ragged with protruding fibers) edges require high expenditure and thus lead to high costs for rework or may even render the processed workpiece unusable. When drilling holes in such materials, ragged edges, so-called delaminations, result, in particular at the hole exit, ie at the point where the drill bit passes through the workpiece. This is very annoying when drilling rivet holes in structural components, for example in aircraft construction. [0003] A drill of the type described here is known from DE 202 09...

Claims

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Application Information

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IPC IPC(8): B23B51/02
CPCB23B51/02B23B2226/27B23B2226/275B23B2251/44Y10T408/81Y10T408/89Y10T408/909Y10T408/9095
Inventor 迪特尔·克雷斯
Owner MAPAL FABRIK FUER PRAEZISIONSWERKZEUGE (DE)
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